It’s 2012 and Rob Moore goes 'into the dirt', undercover, to infiltrate a group of campaigners fighting for a ban on deadly asbestos. None of them knew they had a private spy in the camp. But it's hard to stay hidden forever.

Listen to the full series today. For the premium Tortoise listening experience, curated by our journalists, download the free Tortoise audio app. For early and ad-free access to all our investigative series and daily and weekly shows, subscribe to Tortoise+ on Apple Podcasts.

If you’d like to further support slow journalism and help us build a different kind of newsroom, do consider donating to Tortoise at tortoisemedia.com/support-us. Your contributions allow us to investigate, campaign and explore, and to build a newsroom that is responsible and sustainable.

Hosted on Acast. See acast.com/privacy for more information.